X m mentor



M. C. ROLLAND. SLIDINGVJUINT 0F FLUID PRESSURE APPARATUS. APPLICATIONFILED AUG-7, 1911. RENEWED NOV. 12, I919.

Patented Dec. 23,1919.

2 SHEETS-SHEET l IN W5 A! TOR W7: KM 4M M. C. ROLLAND. SLIDING JOINT 0FFLUID PRESSURE APPARATUS. APPLICATION FILED AUG-7. I917- RENEWED Nov.12, I919.

Patented Dec. 23,1919.

2 SHEETS-SHEET 2.

mmvm

Imam/7 i CE.

MODESTO C. HOLLAND, OF NEW YORK, N: Y.

SLIDING- JOINT or rnnrnrnnssnnn APPARATUS.

Application filed August 7, 19:17, Serial No. 184,812. Renewed November12, 1919. Serial No. 337,628;

To all whom it may concern:

Be it known that I, Monnsro G. RoLLAND, a citizen of the Republic ofMexico, residing in the borough of Manhattan, city of New York, countyof New York, and State of New York, have invented new and usefulImprovements in Sliding Joints of Fluid- Pressure Apparatus, of whichthe following is a specification.

The invention relates to sliding joints of fluid pressure apparatus, andits object is substantially to eliminate friction between the parts incontact, still keeping the joint fluid tight. This is accomplished,without the use of mechanical packings, by providing one of the membersof the joint with a passage which leads from the region of superiorpressure and delivers around the side'in a direction contrary to thepressure.

In the accompanying drawings'illustrao ing schematically some of theapplications of the invention:

Figure 1 is an axial section through a pump containing the invention;

Fig. 2 is an elevation of the parts of the piston slightly separated;

Fig. 3 is an axial section through the chamber of a plunger apparatus,the plunger being in elevation;

Fig. 4 is a longitudinal section of a piston showing a modification;

Fig. 5 is a longitudinal section of a piston having passages at bothsides delivering in opposite directions away from each other; and

Fig. 6 is a longitudinal section through a piston and cylinder showingstill another construction.

In Fig. 1, the pump cylinder 1 has an inlet 7 and an outlet 8. Thepiston 3 secured to piston rod 2 is provided adjacent its pressure facewith a passage 10 having its inlet 4: leading from the pressure face andan outlet 5 delivering around the side into the joint. The passage issuitably formed or recurved so that the outlet 5 delivers more or lesslongitudinally in a direction contrary to. the pressure. This creates acounterpressure or velocity in the joint which opposes the leakage offluid lengthwise of the the piston by fastenings 9, in such manner as toleave an annular passage of the indicated character.

In Fig. 3 the invention is shown in connection with a hydraulic press orcompressor or similar apparatus. Here the packing passage is formed inthe end of the chamber 1 through which the plunger 3 passes. Similarparts are designated by the same reference numerals as in Fig. 1, withthe super-character a. The portion 11 bounded by dotted lines may beomitted.

The piston of Fig. 4 differs from that of Figs. 1 and 2 in having doublerings and passages, both passages leading from and delivering adjacentto the same pressure face and in the same direction. Parts aredesignated by the same numerals with supercharacter 6.

Fig. 5 illustrates the fact that the selfpackingmay also be providedat'the low or atmospheric pressure side, to prevent leakage on thesuction stroke. Accordingly this piston has passages leading from bothof its opposite faces and delivering into the joint adjacent to thesefaces and in opposite directions, away from each other. The supercharacter 0 is used in this view.

Fig. 6 shows a construction which may be used for trunk pistons. Thepiston 2 has a passage 10 adjacent its working face, and another 10toward the opposite end. Others may be provided at intermediate points.All of-these passages have their outlets similarly directed, and thelower passage 10 that is to say the one nearer the crankshaft, to whichthe piston is connected by rod W, is connected with the pressure regionby inlet tubes 4 Numerous other applications and specific constructionsare within the contemplation of the invention. It will be understood, ofcourse, that the clearance between the joint members is greatlyexaggerated in all the views.

What is claimed as new is:

1. A self-packing sliding joint for fluid pressure apparatus, one of theelements of which is provided with a circular passage leading from theregion of superior pressure and recurved and narrowed so as to deliver avelocity stream backward into the joint in a. direction contrary to thepressure.

2. A self-packing sliding joint for fluid pressure apparatus. one of theelements of which is formed with a circular edge recess and providedwith a ring secured in'said'recess, the ring and recess being formed soas to afford a passage leading from the region of superior pressure andrecurved and narrowed so as to deliver a Velocity stream into the jointin the direction contrary to pressure.

- MODESTO c. HOLLAND.

1 Witnesses:

G. H. EMPEY, F. V. SHEEHAN.

